Ervin w



(No Model.)

E. GARTWRIGHT. SMOKE GONSUMING FURNAGB.

'me nonms PETERS cal, wom-mno., wAsHlNm'ou. D, c.

UNrTnD STATES APATENT OFFICE..

EDWARD CARTWRIGHT, rOF WILBER, NEBRASKA, ASSIGNOR OF SEVEN- NINTHS TOWILLIAM H. MANN, JOHN W. VEHN, JR., ALFRED BIGELOW, AND FRANK JELENIK,JR., OF SAME PLACE, JAMES A. PADDOCK, OF DEAD'WOOD, SOUTH DAKOTA, ERVINW. CLANCY AND EMERIC LONGTIN, OF BEATRICE, AND TOBIAS CASTOR, OFLINCOLN, NEBRASKA.

SMOKE`CONSUMING FURNACE.

SPECIFICATION forming part of Letters Patent No. 478,401, dated -Tuly 5,1892'.

Application filed April 28, 1891.

To all whom, it may concern;

Be it known that l, EDWARD CARTWRIGHT, of Wilber, in the county ofSaline and State of Nebraska, have invented a new and useful Improvementin Smoke-Consuming Furnaces, of which the following is a specification.

My invention is in the nature of an improved furnace for heatingboilers, metal- Io lurgical and other uses, which is so constructed asto completely consume the smoke without the use of a blast; and itconsists in the peculiar shape and arrangement of the outlet-Hue ordischarge-conduit, whereby I make available the effects of reliectionand concentration of heat to secure the above results, which I will nowproceed to describe with reference to the drawings, in which- Figure 1is a horizontal section taken zo through the furnace on line 002 002 ofFig. 2, an

interior shell only being shown and the 'masonry being indicated indotted lines. Fig. 2 is aside elevation of a model or shell of thefurnace,looking in the direction of the arrow in Fig. l, the fire-boxbeing broken away to show the position of the grate-bars; and Figs.

3, 4, and 5 are vertical cross-sectional views taken, respectively,through the lines m x, y y,

and z z of Fig. l.

In the drawings, A represents the gratebars of the furnace, having theusual tire-box above and around them and the ash-pit below.

Leading from the fire-box is the outlet-flue or discharge-conduit B C Dfor the products of combustion, the said ue extending from the sidewalls of the tire-box and entering the chimney-stack S. This'fire-boxand outletiiue Will in practice be built of fire-brick, as shown indotted lines in Fig. l; but for pur- 40 poses of illustration it isshown in the form of a detached shell to better show itis shape. Theoutlet-fine in passing from the fire-box to the chimney-stack S curvesthrough a horizontal arc of ninety degrees, and as it proceeds from thefurnace to the chimney it gradually tapers to a smaller transversedimension. The outer Wall b c d of this flue or Serial No. 390.831. (Nomodel.)

conduit is of much greater vertical depth than the inner wall b c d',and the roof portion fect action of my furnace in consuming the smoke inthe following way: As the hot gases and products of combustion turn thecurve of the flue they are from centrifugal action thrown against theouter wall of the curve, where the conduit is made deeper in verticaldirection to accommodate them, and in their passage around this wall ofthe curve they remain for a maximum length of time (being the longerpath) in a position where they receive a maximum amount of heat, first,from the direct radiation of heat from the living coals on the hearth,(see lines L) and, secondly, from the flaming products of combustion.The heat rays Z, striking the concave side of this outer curve, are alsoreflected along down the tapering flue and the heat concentrated in vthetapering channel until the high temperature stimulates a complete unionot' the carbon particles of the smoke with oxygen, absolutely burning up'the smoke and securing the most effective and economical combination ofthe fuel. The arched roof of the iue and the dipping down of the same atthe bridge-wall at point C also have a useful effect in concentratingand intensifying the heat, While the upward cant of the end of the flueat D secures a quick discharge of the contents of combustion Withoutretardation.

My furnace will be found chiefly useful in heating steam-boilers insmelting and in other metallurgical operations; but I do not conline itto this use, but may make it available in all kinds of furnaces.

Having thus described my invention, What I claim as new is- 1. A furnacehaving an outlet-line curved from the side Walls of the tire-box througha horizontal arc of ninety degrees and having greater vertical depthalong thev outer or longer arc than it has along the inner or large arcof the curve than it has upon the xo shorter are, substantially as shownand deinner or smaller are, substantially as shown scribed. anddescribed.

2. A furnace having a tapered or contract- Y 1 f ing outlet-Hue curvedfrom the side Walls of EDWARD CARI WRIGH I" the fire-box through ahorizontal are of ninety Vitnesses: degrees and dipping down at a pointbe- S. D. DAVIS, tween the ends of the ue and also having a J. H. GRIMM,greater vertical depth upon the outer or S. IAIAYEKAFB.

It is hereby certified that in Letters Patent No. 478,401, granted July5, 1892, upon the application of Edward` Cartwright, of Wilber,Nebraska, for an improvement in Smoke-Consuming Furnaces, an errorappears requiring the following correction, viz.: In line 7 of the grantand in theprinted head of the specication, itis stated that saidCartwright assigned seven-ninths to William H. Mann, John W. yWehn, jr.,Al fred Bigelow, and Frank J elenik, jr., of same place, James A.Paddock, of Deadwood, South Dakota, Ervin W. Clancy and Emeric Longtin,of' Beatrice, and Tobias Castor, of Lincoln, Nebraska, whereas it shouldhave been stated that he assignedjve-strvths to said parties; and thatthe said Letters Patent should be read with this correction therein thatthe same may conform to the record of the case in the Patent Office.

' Signed, oountersigned, and sealed this 2d day of August, A. D. 1892. y

[SEAL] CYRUS BUSSEY,

Assistant Secretary of the Interior.

Countersigned N. L. FRoTHlNGHAM,

Acting Commissioner of Patents.

